At 198cm the healthy range is 72.5 to 97.6kg — a window of 25.1 kilograms. Compare that with 150cm, where the same unchanged rule allows 14.4. Forty-eight centimetres of height has widened the healthy window by three quarters, which makes the point that BMI is not a single standard applied evenly. It is a fixed ratio ..
= 6ft 6.0in
YOUR RESULTS
BODY MASS INDEX
17.9
Underweight
BMI PRIME
0.71
Normal = 0.74–1.00
PONDERAL INDEX
9.0
kg/m³
HEALTHY WEIGHT RANGE
72.5 – 97.6 kg
Gain 2.5 kg to reach healthy weight
Below a healthy weight range. Consider consulting a healthcare professional.
BMI GAUGE
YOUR POSITION
FULL SUMMARY
WHO BMI CATEGORIES
The height is already set to 198cm, which is about 6 ft 6 in. Change it if that is not yours and everything below recalculates.
Enter a weight in kilograms. Switching to imperial converts the height to the nearest inch, which is a coarser step — two adjacent even centimetre values can land on the same one.
Read the range before the category. At this height it spans 25.1kg, and every weight inside produces the same verdict.
Treat a reading near a boundary as near a boundary. One kilogram is 0.26 of a point here, and most people vary by more than that across a day.
At 198cm — 1.98m, or about 6 ft 6 in — a BMI of 18.5 puts the lower bound at 72.5kg and a BMI of 24.9 puts the upper bound at 97.6kg. The window is 25.1kg, or about 55 pounds. One kilogram moves the number by 0.26 of a point, so it takes roughly 3.9kg to cross a whole one. On the WHO 2004 cut-offs for South and East Asian populations the upper bound drops to 89.8kg, a reduction of 7.8kg, with the lower bound unchanged.
FORMULA REFERENCE TABLE
| Name | Formula | Description |
|---|---|---|
| BMI (Metric) | BMI = weight(kg) / height(m)² | Divide weight in kg by height in metres squared |
| BMI (Imperial) | BMI = 703 × weight(lbs) / height(in)² | Multiply weight in pounds by 703, divide by height in inches squared |
| Height in metres | h(m) = h(cm) / 100 | Convert centimetres to metres before squaring |
| BMI Prime | BMI Prime = BMI / 25 | Ratio of BMI to upper limit of normal (25). Values >1.00 indicate overweight |
| Ponderal Index | PI = weight(kg) / height(m)³ | More accurate than BMI for very tall or short individuals. Normal: 11–15 kg/m³ |
| Healthy weight | w = BMI × height(m)² | Rearranged BMI formula: weight(kg) for any target BMI at your height |
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Last updated: August 2, 2026 · Formula verified by EagleCalculator team · Source: WHO Global Database on Body Mass Index · Eagle-eyed accuracy for every calculation.